p70 S6 kinase is an enzyme that plays a crucial role in cell growth and metabolism. It is part of the mTOR signaling pathway, which helps cells respond to nutrients and growth factors. By phosphorylating specific proteins, p70 S6 kinase promotes protein synthesis and cell proliferation. This kinase is particularly important in muscle cells and neurons, where it influences growth and development. Dysregulation of p70 S6 kinase activity has been linked to various diseases, including cancer and metabolic disorders, making it a potential target for therapeutic interventions.